What could've caused me to be sick?

Ok so my day started perfectly fine. To start I usually have bad allergies, but I take oregano pills which takes care of that. I shared applesauce with my friend in the morning, and he said his throat hurt a little for a couple of days, but he felt fine that day. I felt great all day, then I smoked at the end of the day with my friend, and she said she was not sick at all, but we were out in the drizzle of rain for an hour. In that time I got bit by mosquitoes a good 10-20 times. Then I got on the bus at 5 pm and I was eating starburst and my throat was a little scratchy , but not bad. I went right to bed and woke up in the night with a sore throat. I woke up at 6 am and I couldn't swallow, my head was pounding, I couldn't satnd without getting winded, and I couldn't breathe through my nose. So what the hell could've caused it?